primary lever length at impact

[12 piece bucket]

I don't think so. The farther ahead the hands are at impact, the later the release, and so more head speed, because the max speed is attained shortly after release point and then starts slowing.

Lots of variables for this to achieve the status of axiomatic....

Look at the pics in the first post...grip type is a HUGE difference....also...fat jack BOMBED it.....hands forward ala Gainey vs. Nicklaus.....Players like Lee Buck/Gainey have to get the amount of shaft lean to have the face open enough so they don't hit it left of left....for mere mortals could be problematic....cats like Mac O'Grady Philly McGlennerd ....love the shaft lean but may air mail a green by hitting a 7 iron 210....it may look sexier .... but who's packin' the hardware???